docs: def push_dcp(event, callback, position='right'):
      """Push a callable for :class:`~flask_pluginkit.PluginManager`, :func:`push_dcp`.
  
      Example usage::
  
          push_dcp('demo', lambda:'Hello dcp')
  
      .. versionadded:: 2.1.0
      """
      ctx = stack.top
      ctx.app.extensions.get('pluginkit').push_dcp(event, callback, position)